Scanning Electrochemical Microscopy of Precursor Sites for Pitting Corrosion on Titanium

Norberto Casillas, Steven J. Charlebois, William H. Smyrl

Research output: Contribution to journalArticlepeer-review

138 Scopus citations

Abstract

Scanning electrochemical microscopy, SECM, of oxide-covered titanium foils (~50 A oxide thickness) immersed in potassium bromide solutions is reported. Electrogeneration of bromine (2 Br-→ Br2+ 2e-) at the TiO2 film is shown to occur rapidly at a few microscopic surface sites. The regions of intense faradaic activity observed in SECM images correlate directly with the location of pit nucleation. The direct correspondence between sites of faradaic activity and oxide breakdown provides a means of identifying precursor sites for pit formation.

Original languageEnglish (US)
Pages (from-to)L142-L145
JournalJournal of the Electrochemical Society
Volume140
Issue number9
DOIs
StatePublished - Sep 1993

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